Yes, if I attend a sporting event, concert, theme park, etc. I have no issue paying for parking. However, I would not pay for parking in order to drop a ton of $$$ at a WDW resort restaurant. Period.
And my point is that Disney probably won't miss you.
We do a lot of resort dining. Like every night of vacation we dine at a resort - food is usually better than the park restaurants and we are food snobs. With the exception of Citricos, Saana and V&As, I think we've been to every single resort restaurant at Disney (oh, we haven't been to whatever is now in the Spoodles spot). Those ADRs need to be booked in advance, like all other Disney dining. Guest services gets a lot of complaints that open spots are not held for resort guests - first time guests discover they can't even get a meal at their own hotel. Walkups are frequently turned away.
As I've said, where Disney has issues, its on the supply side, not the demand side. They have too little supply for the demand - for possibly everything now except hotel rooms almost year round. (And there are still a few walk on attractions - capacity for the Tiki Birds continues to meet demand). You make Fastpass reservations months in advance. Getting a picture with Mickey or the Princesses involves a huge line, and they don't have enough tables for everyone who wants to eat in a sit down restaurant to do so. They don't have a lot of room for expansion in Orlando, so they'll need to manage demand. (And if you don't understand, somewhere out on the internet there is (or was) a buildable land map for WDW - most of what isn't built on can't be built on - environment impact or the land isn't stable enough - there are a few remaining plots, but not much). Resort restaurants and resort parking both have the same supply side issue as the rest of Disney.
The other issue is that Disney would far rather have onsite guests than day guests. Onsite guests (particularly those without a car), tend to eat all their meals at Disney, don't tend to visit Universal or SeaWorld for a day or two of their vacation. Plus, onsite guests (except DVC members) are paying overinflated hotel room prices with huge margins. So if they encourage people to book hotel rooms, that's good. Even better if you discourage them from having a car - then its really hard for them to give Universal money (DVC gives them a heck of a lot of high margin revenue quickly rather than high margin revenue over a long time - its a different model).
Note that I'm not saying this is "fair" or "right" - but that Disney is first and foremost a business with a fiduciary responsibility to its shareholders. That means that they will maximize profit. An offsite guest is simply less profitable than an onsite guest. (And a Value guest less profitable than a Deluxe guest if you want to see where this can lead should Disney need to manage demand in excess of this step.)